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circuit only work for the modulation cell, user can set parameter via this part.

Amplifier circuit contains preamp, power amplifier, and power monitor. The RF signal from

modulation goes to rated power after this amplifier circuit. This part also has separate

control-display circuit for listing the information as power, voltage, current, temperature, and

showing working status.

4. Test Instrument

Name

Type

Specification

Manufacturer

Television Generator

TSG-271

Tektronix

TV Monitoring Receiver

PM5696

Philip

Video Measurement Set

VM700A

Tektronix

Audio Analyzer

P1DD

Audio Precision

Video Modulate

Audio Modulate

Preamp

Power

Amplifier

Power Supply

MCU

LCD

Display

COM

Interface

Figure 3-1 ZHC518A-50~300W TV transmitter

Structure and function

Power Monitor

RF Output

Key

Buttons

AC 220V

Input

Video Input

Audio Input

Power Supply

LCD Display

Key Buttons

Содержание FU-300W

Страница 1: ...www fmuser org www fmuser org 1 FU 300W TV Transmitter User s Manual...

Страница 2: ...ice first 2 A 50 Ohm dummy load or antenna and cable must be connected before turning power on avoiding water going into the connecters or the cable 3 Please read System Control Logic section to fully...

Страница 3: ...2 Technical Specifications 5 3 System Structure and Function 6 4 Test Instrument 7 5 Test and Maintenance 8 6 Panel Function Description 8 7 Power on Sequence 9 8 System Control Logic 10 9 Direction...

Страница 4: ...ether the machine has connected the ground through the wire and the lead to prevent the electric shock c Use the proper fuse Please use the stipulated type and rating fuse d Provide good ventilation T...

Страница 5: ...turn on or turn off TV transmitter by remote command 2 Technical Specifications 2 1 Technical Index 2 1 1 Video Index 1 Video input impedance 75 2 Video input level 1 0Vp p 3 Video modulating rate 87...

Страница 6: ...l Specifications RF output connector L16 L27 Casing Size 4U 484mm 172mm 600mm 19Inch Weight Ambient temperature 5 40 Relative Humidity 95 Sea Level Height 4500m 3 System Structure and Function This TV...

Страница 7: ...power voltage current temperature and showing working status 4 Test Instrument Name Type Specification Manufacturer Television Generator TSG 271 Tektronix TV Monitoring Receiver PM5696 Philip Video Me...

Страница 8: ...nd some of their technical specifications is much higher than the national standards and industry standards 5 1 Performance Test To ZHC515A family TV transmitter video index and RF index need to be te...

Страница 9: ...fmuser org 9 the digital FM broadcast transmitter works at a very dirty environment for example a place with much of dust it must be to replace fans ahead of schedule 6 Panel Description 6 1 Front Pa...

Страница 10: ...RF output can be controlled by RF Switch which is on the Main Page of the LCD When RF Switch is OFF turn off RF power When RF Switch is ON and the video signal input is normal turn RF power on 8 2 Rem...

Страница 11: ...then pressing or key making window frame at If LCD displays picture 1 it means no video signal input If LCD displays picture 2 and video is AGC status modulating degree automatically changes to 87 5...

Страница 12: ...on the front panel putting LCD Display under paging status and then pressing or key making window frame at User can press Select key entering variable status and then pressing or key achieving desirab...

Страница 13: ...n the front panel putting LCD Display under paging status and then pressing or key making window frame at Frequency 543 25MHz is the video carrier frequency Channel 22ch means current channel is chann...

Страница 14: ...r Power Amplifier Cell There is LCD Up key Down Key Enter key on the front panel for user to operate and view parameter of Amplifier Cell Up key Down key Enter key User can select page and save parame...

Страница 15: ...2 shows main menu page This page contains the parameter as following RF SWITCH RF switch control select between ON or OFF FWD POWER forward power display only RFL POWER reflected power display only AM...

Страница 16: ...ers it should to be enter the SET page FWD POWER forward power RFL POWER reflected power AMP VOLTAGE amplifier voltage DRV CURRENT current of preamp AMP CURRENT current of power amplifier TEMPERATURE...

Страница 17: ...rotect Normal forward power is normal Warning forward power is higher than setting power Protected forward power is too high RF power is turned off RFL POWER Normal Warning Protect Protect H Normal re...

Страница 18: ...wer is turned off TEMPERATURE Normal Warning Protect Normal temperature is normal Warning temperature is high may cause RF power drop Protected temperature is too high RF power is turned off EXIT retu...

Страница 19: ...ideo While output power is normal this lamp is light 10 2 4 Lamp for REMOTE In the page of Set if Remote is enabled this yellow light is illuminant 10 2 5 Lamp for TEMP When the amplifier temperature...

Страница 20: ...r this mode of equipment 11 Failure Check 11 1 Turn on the power supply but the equipment doesn t work it may The fuse is broken change the fuse The plug is not inserted tightly or contacted fault ins...

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